Date: Tue, 23 Nov 2004 23:52:50 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: cswiger@mac.com Cc: alex.wilkinson@dsto.defence.gov.au Subject: Re: Transparent bridges (a. k. a. HUB-to-PCI bridges)? Message-ID: <20041123.235250.118899687.imp@bsdimp.com> In-Reply-To: <41A416E7.4030107@mac.com> References: <200411231343.22760.jhb@FreeBSD.org> <20041124002603.GD20881@squash.dsto.defence.gov.au> <41A416E7.4030107@mac.com>
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In message: <41A416E7.4030107@mac.com>
Chuck Swiger <cswiger@mac.com> writes:
: > Can you please elaborate on the following .... please ;-\
: >
: > 1. PCI bridges
: > - Host-PCI
: > - PCI-PCI
:
: A host-PCI bridge is typically part of the "southbridge" chip of modern
: motherboards; on Intel motherboards this is also called the ICH chip, such as
: the 82801AA/BA/CA/etc. VIA Southbridges include the VT8233/8235/8237/etc.
:
: A PCI-PCI bridge is commonly found on multifunction PCI cards, an example
: would be the DEC 21151 chip found on various four-port NICs.
Newer laptops (and other machines) typically have a PCI PCI bridge
that all the builtin hardware lives behind. Many, but not all, of
these bridges are transparent pci pci bridges, maning they act much
like a subtractively decoded bridge.
Warner
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